Adsense is a google product which display relevant advertisements according to your content.Google publishers can only use Adsense service and you need to apply for it to become publisher.Google Adsense is dream of every blogger though you can earn more money with affiliate but Adsense proves that your site contains quality content which inspire others to visit.
However if you are approved by Google Adsense team then first I would like to congratulate you for this achievement.However what next ? its definitely about your earning.Research Adsense to know which ad unit gives you the best CPC.
For applying different ad formats you may need to create several ad units.It has been seen that publishers they create ad units and after certain time if cpc gets low they change to new d unit.Therefore those ad units become inactive and not display in Adsense “My Ads section” but you can reuse the Adsense code again and again.
To display all the ad units go to advanced filters” and select which ad unit you want to display.See the screenshot below for easy implementation.
Hope now you can see all the advertisement codes in your “My Ads” section.Contact me if face any problem.